Comparators; Devices emitting ultraviolet (UV) light for detecting counterfeit gemstones, diamond, moissanite; Electronic apparatus for testing the electrical conductivity of gemstones, diamond, moissanite; Laboratory apparatus and instruments for the exchange of substances and heat; Laboratory instruments, namely, radiation devices in the nature of ultraviolet, visible, or infra-red light boxes for the analysis of bodily fluids; Metal detectors; Optical inspection apparatus; Optical inspecti...